About 1 in 7 Americans lives in rural parts of the country—1,800 counties that sit outside any metropolitan area. A generation ago, most of these places had working economies, a strong social fabric and a way of life that drew a steady stream of urban migrants. Today, many are in crisis.

Winner-take-all urbanism is another manifestation of the winner-take-all economics of the past few decades, in which a relatively small number of players reap a very large share of the rewards, upending whole industries with their outsized returns.

About 1 in 7 Americans lives in rural parts of the country—1,800 counties that sit outside any metropolitan area. A generation ago, most of these places had working economies, a strong social fabric and a way of life that drew a steady stream of urban migrants. Today, many are in crisis.